Reasons to dislike broody hens:
--A broody hen does not lay eggs while she is broody.
--A broody hen sits in the nestbox, and may get in the way of other hens wanting to lay.
--A broody hen eats less and loses weight, and people get worried about her (most will be fine, but a few stupid hens will sit on the nest and starve to death, rather than come off to eat enough each day.)
--Breaking the broodiness is an extra step to fuss with.
--If you don't break the broodiness, the hen will keep sitting for weeks or occasionally months. She will not lay eggs again until some weeks after she quits being broody.
On the other hand, broody hens are great if you like to have them hatch eggs and raise chicks.